COMPATIBILITY OF PROPELLAENT GRAIN DIMENSIONS AND CHARGE WEIGHT TOLERANCES WITH AUTOMATIC WEIGHING AND LOADING OF CANNON PROPELLANT
Abstract
The effect of charge weight tolerances on ballistic dispersion of complete rounds was investigated in order to determine the extent to which the charge weight tolerances mig t be relaxed to facilitate propellant weighings and loadings by automatic machinery. Relaxed charge weight tolerances were incorporated in nine specifications after it was determined that adverse effects on variations in pressure or velocity would not result. Propellant grain geometry was also analyzed. The investigation included statistical analyses of propellant grain straightness, length, and web dimensions. Results indicated that a partial relaxation of charge weight tolerances can be accomplished without jeopardizing ballistic quality of complete rounds. A minimum relaxation of charge weight tolerances to ! 0.25 ounces is considered appropriate for a number of complete rounds, with the reservation that further relaxation be accomplished only if and when actual machine charge weight tolerance requirements become known for specific items. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1961
- Accession Number
- AD0262074
Entities
People
- Austin D. Stanfield
Organizations
- Picatinny Arsenal